Hmm... if it's a 2TB drive and the only two drives (ie partitions) that showed up when you plugged it in were E: 100MB and F: 465 GB then there have to be ~1.4 Gigs hiding somewhere. As the 1.4 Gigs (roughly) didn't show up, I assumed it was unallocated space. What do you see?
It's all good. Keep in mind if it's still unallocated space as in your initial screen shot, you'll still need to right click the drive in disk management and create a volume for you to be able to use it.